Total.of 28 end pieces. The actual top square hole measures exactly 9/16" so I am not positive if you use these for 9/16" square tubing or 1/2" and tighten the slack in with the set screw? Maybe either or? These aluminum square hole with set screw angled pitch balusters, we provide stair shoes which lay at the bottom of your baluster or can be secured up under your handrail. The purpose of stair shoes is not to support the baluster structurally but to add a more finished look or extra decorative element. They also make installation easier by hiding all the gaps you get from drilling the iron baluster holes.